Expand "workspace/willRenameFiles" support to include folders.

[rgrunber]

• Fixes Filter reported for workspace/willRename excludes folders/packages #3183
• Allow folder renames to trigger workspace/willRenameFiles since the
  language server can update source files during such an operation

--- old.txt	2024-06-12 15:50:40.782112655 -0400
+++ new.txt	2024-06-12 15:53:20.175658497 -0400
@@ -8,6 +8,13 @@
                         "matches": "file"
                     },
                     "scheme": "file"
+                },
+                {
+                    "pattern": {
+                        "glob": "**",
+                        "matches": "folder"
+                    },
+                    "scheme": "file"
                 }
             ]
         }